Just found that topic a few days ago, read it all and thought I might share as well...
My boyfriend and I are both about 30yo, around 6ft tall, both good looking I'd say. We've been together for 5 years and started to organize occasional threesomes like 2 years ago.
When we jerk off together we tend to talk about our fantasies and for a while now he's been telling me he would like to watch me (or rather listen to me from another room) have sex with hot twinks. I like the idea a lot, it really gets me hard... I'm pretty sure that we'll try it for real at some point but I'm still a bit unsure that it would be a good thing to do. He's a bit insecure, often afraid that guys on grindr will like my pictures more than his, etc.
I need to add something: at some point last year he confessed he had cheated on me on several occasions. I won't blame him too much for that, I had issues talking to him about sex at the time, etc. That hurt me a lot when I learned though, and still does sometimes. I know cuckolding often means experiencing with mixed feelings of excitment and jealousy but everytime he talks to me about his fantasies of knowing I'm fucking other guys, I feel like he might incite me to do it so he doesn't have to feel bad anymore for what he has done in the past. Well, he says it has nothing to do with that but I don't know... and even if it does have something to do with all of that, maybe I should not care too much about it because in the end I think it's true that he would like it to happen.
Sorry that was long and maybe unclear but that's where we're at for now! Maybe more to come... who knows?
